Street", I-75 is listed on the National Highway System (NHS) for its entire length; the NHS is a network of roadways important to the country's economy, defense, and mobility. The freeway is the busiest in the state: between M-8 (Davison Highway) and McNichols Road in Detroit approximately 194,300 vehicles used the freeway on average each day in 2010; in contrast the lowest traffic level was 3,208 vehicles between the M-48 and M-80 interchanges in Chippewa County. I-75 carries segments of all four Great Lakes Circle Tours in the state. It is also the only highway located on both Michigan's Upper and Lower peninsulas (UP and LP, respectively). Between the Ohio state line and Kawkawlin, I-75 contains between a minimum of six and a maximum of ten lanes total; other sections vary between four and six lanes in total. Lake Erie shore and the Downriver communities Crossing the state line north of Toledo, Ohio, I-75 enters Michigan in Monroe County carrying the Lake Erie Circle Tour (LECT) near the North Maumee Bay of Lake Erie. The freeway runs parallel to the shoreline of the Great Lake and past the community of Luna Pier. Further north, I-75 passes to the southeast of Monroe and crosses the River Raisin between the city and the river mouth. North of the river, the freeway turns further inland running through farmland. Near Newport, I-275 splits off to the northwest and I-75 continues its northeastward trek through Monroe County. When it crosses the Huron River, the trunkline enters Wayne County between South Rockwood and Rockwood. On the north side of the county line, I-75 begins to run inland of, and parallel to, the Detroit River, entering the Downriver area. The freeway turns northerly after the interchange with M-85 (Fort Street) near Gibraltar, and the LECT departs I-75 to follow M-85 north of the interchange. The landscape transitions to suburban residential areas instead of farmland through this area. The freeway turns back northeasterly in Taylor and intersects the southern end of M-39 (Southfield Highway) in Lincoln Park. I-75 crosses the Ecorse River and passes through an industrial area of Metro Detroit. Farther north, the freeway spans the River Rouge in the southern part of Detroit. I-75 parallels M-85 (Fort Street) and follows the Detroit River as far east as the Ambassador Bridge. Near the bridge's approaches, the freeway turns 90° away from the river and intersects the eastern